Android程序版本更新--通知栏更新下载安装（转）

PackageInfo packageInfo = context.getPackageManager().getPackageInfo(context.getPackageName(), 0);
int localVersion = packageInfo.versionCode;

 /**
   * 下载apk
   * 
   * @param apkUri
   */
private void downLoadNewApk(String apkUri, String version) {
        manager = (NotificationManager) context
                .getSystemService((context.NOTIFICATION_SERVICE));
        notify = new Notification();
        notify.icon = R.drawable.ic_launcher;
        // 通知栏显示所用到的布局文件
        notify.contentView = new RemoteViews(context.getPackageName(),
                R.layout.view_notify_item);
        manager.notify(100, notify);
        //建立下载的apk文件
      File fileInstall = FileOperate.mkdirSdcardFile("downLoad", APK_NAME
                + version + ".apk");
        downLoadSchedule(apkUri, completeHandler, context,
                fileInstall);
    }

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginLeft="10dp"
    android:background="#00000000"
    android:padding="5dp" >

    <ImageView
        android:id="@+id/notify_icon_iv"
        android:layout_width="25dp"
        android:layout_height="25dp"
        android:src="@drawable/ic_launcher" />

    <TextView
        android:id="@+id/notify_updata_values_tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="6dp"
        android:layout_marginLeft="15dp"
        android:layout_marginTop="5dp"
        android:layout_toRightOf="@id/notify_icon_iv"
        android:gravity="center_vertical"
        android:text="0%"
        android:textColor="@color/white"
        android:textSize="12sp" />

    <ProgressBar
        android:id="@+id/notify_updata_progress"
        style="@android:style/Widget.ProgressBar.Horizontal"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/notify_icon_iv"
        android:layout_marginTop="4dp"
        android:max="100" />
</RelativeLayout>

   /**
     * 连接网络,下载一个文件,并传回进度
     * 
     * @param uri
     * @param handler
     * @param context
     * @param file
     */
public static void downLoadSchedule(final String uri,
            final Handler handler, Context context, final File file) {
        if (!file.exists()) {
            handler.sendEmptyMessage(-1);
            return;
        }
        // 每次读取文件的长度
        final int perLength = 4096;
        new Thread() {
            @Override
            public void run() {
                super.run();
                try {
                    URL url = new URL(uri);
                    HttpURLConnection conn = (HttpURLConnection) url
                            .openConnection();
                    conn.setDoInput(true);
                    conn.connect();
                    InputStream in = conn.getInputStream();
                    // 2865412
                    long length = conn.getContentLength();
                    // 每次读取1k
                    byte[] buffer = new byte[perLength];
                    int len = -1;
                    FileOutputStream out = new FileOutputStream(file);
                    int temp = 0;
                    while ((len = in.read(buffer)) != -1) {
                        // 写入文件
                        out.write(buffer, 0, len);
                        // 当前进度
                        int schedule = (int) ((file.length() * 100) / length);
                        // 通知更新进度（10,7,4整除才通知，没必要每次都更新进度）
                        if (temp != schedule
                                && (schedule % 10 == 0 || schedule % 4 == 0 || schedule % 7 == 0)) {
                            // 保证同一个数据只发了一次
                            temp = schedule;
                            handler.sendEmptyMessage(schedule);
                        }
                    }
                    out.flush();
                    out.close();
                    in.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }.start();
    }

/**
  * 更新通知栏
  */
 private Handler completeHandler = new Handler() {
        public void handleMessage(android.os.Message msg) {
            // 更新通知栏
            if (msg.what < 100) {
                notify.contentView.setTextViewText(
                        R.id.notify_updata_values_tv, msg.what + "%");
                notify.contentView.setProgressBar(R.id.notify_updata_progress,
                        100, msg.what, false);
                manager.notify(100, notify);
            } else {
                notify.contentView.setTextViewText(
                        R.id.notify_updata_values_tv, "下载完成");
                notify.contentView.setProgressBar(R.id.notify_updata_progress,
                        100, msg.what, false);// 清除通知栏
                manager.cancel(100);
                installApk(fileInstall);
            }
        };
    };

/**
  * 安装apk
  * 
  * @param file
  */
private void installApk(File file) {
        Intent intent = new Intent();
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        intent.setAction(android.content.Intent.ACTION_VIEW);
        intent.setDataAndType(Uri.fromFile(file),
                "application/vnd.android.package-archive");
        context.startActivity(intent);
    }